Implement fix for auto-closing database unlock dialog when file is unavailable

Co-authored-by: droidmonkey <2809491+droidmonkey@users.noreply.github.com>

src/gui/DatabaseOpenWidget.cpp

@@ -257,7 +257,12 @@ void DatabaseOpenWidget::load(const QString& filename)
     // Read public headers
     QString error;
     m_db.reset(new Database());
-    m_db->open(m_filename, nullptr, &error);
+    bool openSuccess = m_db->open(m_filename, nullptr, &error);
+    
+    // If opening failed (e.g., file doesn't exist), show an informative message
+    if (!openSuccess && !error.isEmpty()) {
+        m_ui->messageWidget->showMessage(error, MessageWidget::MessageType::Warning);
+    }
 
     m_ui->fileNameLabel->setRawText(m_filename);
 

src/gui/DatabaseTabWidget.cpp

@@ -163,9 +163,11 @@ void DatabaseTabWidget::addDatabaseTab(const QString& filePath,
     QString canonicalFilePath = fileInfo.canonicalFilePath();
 
     if (canonicalFilePath.isEmpty()) {
+        // Don't return early - continue to show unlock dialog even if file is missing
+        // This allows user to retry when file becomes available (e.g., cloud storage mounting)
         emit messageGlobal(tr("Failed to open %1. It either does not exist or is not accessible.").arg(cleanFilePath),
                            MessageWidget::Error);
-        return;
+        canonicalFilePath = cleanFilePath; // Use the original path for comparison
     }
 
     for (int i = 0, c = count(); i < c; ++i) {

tests/gui/TestGui.cpp

@@ -2464,6 +2464,41 @@ void TestGui::testMenuActionStates()
     QVERIFY(isActionEnabled("actionPasswordGenerator"));
 }
 
+void TestGui::testOpenMissingDatabaseFile()
+{
+    // Test that when trying to open a non-existent database file,
+    // the unlock dialog is still shown (instead of auto-closing)
+    // This allows user to retry when the file becomes available (e.g., cloud storage mounting)
+    
+    const QString nonExistentPath = "/tmp/does_not_exist.kdbx";
+    
+    // Ensure the file doesn't exist
+    QFile::remove(nonExistentPath);
+    QVERIFY(!QFile::exists(nonExistentPath));
+    
+    // Record initial tab count
+    int initialTabCount = m_tabWidget->count();
+    
+    // Try to add database tab with non-existent file
+    // This should NOT fail but should create a tab and show unlock dialog
+    m_tabWidget->addDatabaseTab(nonExistentPath);
+    
+    // Verify that a tab was created (unlock dialog shown)
+    QCOMPARE(m_tabWidget->count(), initialTabCount + 1);
+    
+    // Get the database widget for the new tab
+    auto* dbWidget = m_tabWidget->currentDatabaseWidget();
+    QVERIFY(dbWidget);
+    
+    // Verify the database is in a state where it can be unlocked
+    // (not closed/rejected due to missing file)
+    QVERIFY(dbWidget->isLocked());
+    
+    // Close the tab to clean up
+    m_tabWidget->closeDatabaseTab(m_tabWidget->currentIndex());
+    QCOMPARE(m_tabWidget->count(), initialTabCount);
+}
+
 void TestGui::addCannedEntries()
 {
     // Find buttons

tests/gui/TestGui.h

@@ -71,6 +71,7 @@ private slots:
     void testTrayRestoreHide();
     void testShortcutConfig();
     void testMenuActionStates();
+    void testOpenMissingDatabaseFile();
 
 private:
     void addCannedEntries();